While the 7800 can use the extensive library of 2600 peripherals and
accessories, very few items were made specifically for the system. In
the same vein, there is not an extensive catalog of prototype items either.
Very few unreleased games have been discovered, and there is only a handful
of hardware, but there are certainly some interesting items. In most cases
you can click the image for a larger picture.

Picture

Description

Atari 7800
The Atari 7800. There are several variations of this machine,
the notable difference being the presence of the expansion slot
on the left side of the console. This expansion slot only appeared on early versions of the 7800, and unfortunately no hardware was ever released to take advantage of it. Some later versions of the 7800 have compatibility problems with a select few 2600 cartridges, most notably Robot Tank, Decathlon, Space Shuttle, Time Pilot, Kool-Aid Man and the Supercharger.
Outside of North America, the 7800 was released with Asteroids
built-in to the ROM OS. In Australia and New Zealand, it included
the 32-in-1 game cartridge as a pack-in.

Atari Proline Joystick
This is the specially designed joystick that was included with
the 7800. It has the advantage of two independently functioning
fire buttons, but suffers from an awkward design that makes
it uncomfortable.

Atari Joypad
Similar to an NES controller, this Atari-made gamepad was the
pack-in for the 7800 when it was sold in Europe. Although rare
in the US, they are not hard to find in Europe. However, they
were sold separately in very small quantities in their own box,
and this is very hard to find.

Atari High Score Cartridge
Announced at the beginning of the Atari 7800 launch in 1984,
Atari never released this product. In 2000, Curt Vendel and
Gary Rubio restarted this project and actually brought it to
market in limited quantities. It's a piggy-back cartridge that
allows you to record your high score, but it's only compatible
with certain cartridges.

Atari XE Light Gun
Atari didn't make a gun specifically for the 7800, so owners
had to purchase the XE gun that is fully compatible.

Best Joystick
Available from Best
Electronics, this is similar to the standard 7800 controller,
but is a bit sturdier, and also features auto-fire.

Best Light Gun
Available from Best
Electronics, this is a compatible light gun for the 7800
made by a long-time Atari dealer.

Telegames Super Deluxe Joystick
Available from Telegames,
this is a replacement joystick for your 7800, made by Telegames.

Atari 7800 prototype console
Prototypes were sometimes created from translucent plastic such
as this.

Atari Proline controller prototype
Made of the same translucent plastic.

Atari 7800 Keyboard Prototype
Announced at the launch of the 7800, the keyboard was unfortunately
never released. The keyboard plugs into joystick port #2 on
the 7800 and theoretically turns it into a full blown computer,
allowing it to use the full line of Atari 400/800 computer peripherals
(software would still be incompatible however). It was also
going to be packaged with system BASIC and a word processor
called VideoWriter.